<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- Tab栏 -->
            <el-form
                    :model="addForm"
                    :rules="addFormRules"
                    ref="addFormRef"
                    label-width="100px"
                    label-position="top"
            >
                <el-tabs
                        v-model="activeIndex"
                        :tab-position="'left'"
                        :before-leave="beforeTabLeave"
                        @tab-click="tabClicked"
                >
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                    v-model="addForm.goods_cat"
                                    :options="cateList"
                                    :props="cascaderProps"
                                    @change="handleChange"
                            ></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item
                                v-for="item in manyTableData

            "
                                :key="item.attr_id"
                                :label="item.attr_name"
                        >
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action: 图片上传的API接口地址 -->
                        <el-upload
                                :action="uploadURL"
                                :on-preview="handlePreview"
                                :on-remove="handleRemove"
                                :headers="headerObj"
                                list-type="picture"
                                :on-success="handleSuccess"
                        >
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品 -->
                        <el-button type="primary" class="btnAdd" @click="addGoods">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
            <img :src="picPreviewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
    import _ from 'lodash'
    export default {
        data () {
            return {
                // 步骤条默认激活 与左侧Tab联动
                activeIndex: '0',
                // 添加商品的表单对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属分类数组
                    goods_cat: [],
                    // 图片的数组
                    pics: [],
                    // 商品详情描述
                    goods_introduce: '',
                    attrs: []
                },
                addFormRules: {
                    goods_name: [
                        { required: true, message: '请输入商品名称', trigger: 'blur' }
                    ],
                    goods_price: [
                        { required: true, message: '请输入商品价格', trigger: 'blur' }
                    ],
                    goods_weight: [
                        { required: true, message: '请输入商品重量', trigger: 'blur' }
                    ],
                    goods_number: [
                        { required: true, message: '请输入商品数量', trigger: 'blur' }
                    ],
                    goods_cat: [
                        { required: true, message: '请选择商品分类', trigger: 'blur' }
                    ]
                },
                // 商品列表
                cateList: [],
                // 级联选择器配置
                cascaderProps: {
                    expandTrigger: 'hover',
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children'
                },
                // 动态参数列表数据
                manyTableData: [],
                // 静态属性列表数据
                onlyTableData: [],
                // 图片上传地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的请求对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
                picPreviewPath: '',
                // 图片预览对话框
                previewDialogVisible: false
            }
        },
        created () {
            this.getCateList()
        },
        computed: {
            getCateId () {
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        },
        methods: {
            // 获取商品分类数据列表
            async getCateList () {
                const { data: res } = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品列表失败！')
                }
                this.cateList = res.data
            },
            // 级联选择器选中项变化时出发
            handleChange () {
                if (this.addForm.goods_cat.length !== 3) {
                    this.addForm.goods_cat = []
                }
            },
            beforeTabLeave (activeName, odlActiveName) {
                // 未选中商品分类阻止Tab标签跳转
                if (odlActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类')
                    return false
                }
            },
            // Tab标签被选中时触发
            async tabClicked () {
                // 访问动态参数面板
                if (this.activeIndex === '1') {
                    const { data: res } = await this.$http.get(
                        `categories/${this.getCateId}/attributes`,
                        {
                            params: { sel: 'many' }
                        }
                    )
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败！')
                    }
                    res.data.forEach(item => {
                        item.attr_vals =
                            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                } else if (this.activeIndex === '2') {
                    const { data: res } = await this.$http.get(
                        `categories/${this.getCateId}/attributes`,
                        {
                            params: { sel: 'only' }
                        }
                    )
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败！')
                    }
                    this.onlyTableData = res.data
                }
            },
            // 处理图片预览
            handlePreview (file) {
                this.picPreviewPath = file.response.data.url
                this.previewDialogVisible = true
            },
            // 处理移除图片的操作
            handleRemove (file) {
                // 1.获取将要删除图片的临时路径
                const filePath = file.response.data.tmp_path
                // 2.从pics数组中，找到图片对应的索引值
                const i = this.addForm.pics.findIndex(x => x.pic === filePath)
                // 3.调用splice方法，移除图片信息
                this.addForm.splice(i, 1)
            },
            // 监听图片上传成功事件
            handleSuccess (response) {
                // 1.拼接得到一个图片信息对象 临时路径
                const picInfo = { pic: response.data.tmp_path }
                // 2.将图片信息对象，push到pics数组中
                this.addForm.pics.push(picInfo)
            },
            // 添加商品
            addGoods () {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return this.$message.error('请填写必要的表单项！')
                    // 发送请求前：需对提交的表单进行处理goods_cat attrs
                    // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
                    // 以上写法不对：级联选择器绑定的对象goods_cat要求是数组对象
                    // 解决办法: 包：lodash 方法（深拷贝）：cloneDeep(boj)

                    // 将this.addForm进行深拷贝
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')

                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    // 发起请求添加商品
                    // 商品名称必须是唯一的
                    const { data: res } = await this.$http.post('goods', form)
                    if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
                    this.$message.success('添加商品成功!')
                    this.$router.push('/goods')
                })
            }
        }
    }
</script>

<style lang='less' scoped>
    .el-checkbox {
        margin: 0 8px 0 0 !important;
    }
    .previewImg{
        width: 100%;
    }
    .btnAdd{
        margin-top: 15px
    }
</style>
